With affective computing technology, participants in interactive media art are getting opportunities to express their emotion in various ways. However, exsisting ways of expression by visual and auditory experiences leads to limitations of interactivity in media art. This paper outlines an experiment to express human emotion as immaterial ‘water’ through an immateriality-based media artwork, ‘Sentimentail’. Sentimentail is an interactive installation that takes the form of a piano. By performing music with the Sentimentail, an audience can reflect their emotion, resulting in the ‘taste’ and ‘color’ of a cocktail. Gustatory and tactile experience through the Sentimentail enlarges the interactivity of emotion-based media art by giving a participant a personalized cocktail. This study helps media artists to make artwork by showing a theorical and systemical approach to emotion-based media art using immaterial water. It took award in Davinci Creative Idea Contest 2015 of the Seoul Art Space Geumcheon.